[PATCH v2] kasan: support panic_on_warn

[PATCH v2] kasan: support panic_on_warn

[Dmitry Vyukov]

If user sets panic_on_warn, he wants kernel to panic if there is
anything barely wrong with the kernel. KASAN-detected errors
are definitely not less benign than an arbitrary kernel WARNING.

Panic after KASAN errors if panic_on_warn is set.

We use this for continuous fuzzing where we want kernel to stop
and reboot on any error.

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Cc: kasan-dev@googlegroups.com
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org

---

Changes from v1:
 - don't reset panic_on_warn before calling panic()
---
 mm/kasan/report.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 24c1211..0ee8211 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -133,6 +133,8 @@ static void kasan_end_report(unsigned long *flags)
 	pr_err("==================================================================\n");
 	add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
 	spin_unlock_irqrestore(&report_lock, *flags);
+	if (panic_on_warn)
+		panic("panic_on_warn set ...\n");
 	kasan_enable_current();
 }
 
-- 
2.8.0.rc3.226.g39d4020

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Re: [PATCH v2] kasan: support panic_on_warn

[Andrey Ryabinin]

On 10/17/2016 11:59 AM, Dmitry Vyukov wrote:
> If user sets panic_on_warn, he wants kernel to panic if there is
> anything barely wrong with the kernel. KASAN-detected errors
> are definitely not less benign than an arbitrary kernel WARNING.
> 
> Panic after KASAN errors if panic_on_warn is set.
> 
> We use this for continuous fuzzing where we want kernel to stop
> and reboot on any error.
> 
> Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
> Cc: kasan-dev@googlegroups.com
> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
> Cc: Alexander Potapenko <glider@google.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: linux-mm@kvack.org
> Cc: linux-kernel@vger.kernel.org
> 
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>

> ---
> 
> Changes from v1:
>  - don't reset panic_on_warn before calling panic()
> ---
>  mm/kasan/report.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/mm/kasan/report.c b/mm/kasan/report.c
> index 24c1211..0ee8211 100644
> --- a/mm/kasan/report.c
> +++ b/mm/kasan/report.c
> @@ -133,6 +133,8 @@ static void kasan_end_report(unsigned long *flags)
>  	pr_err("==================================================================\n");
>  	add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
>  	spin_unlock_irqrestore(&report_lock, *flags);
> +	if (panic_on_warn)
> +		panic("panic_on_warn set ...\n");
>  	kasan_enable_current();
>  }
>  
> 

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